Akkreditierungsurkunde
Accreditation as test laboratory according to DIN EN ISO/IEC 17025
We are a DAkkS accredited testing laboratory for DIN EN ISO/IEC 17025 (General Requirements for the Competence of Testing and Calibration Laboratories):
- determination of emissions and immissionsof sounds,
- the assessment of speech intelligibility,
- Building acoustics and
- the Immission Control module (country specific).

The accreditation is registered under the number D-PL-20822-01-00 and applies to the procedures listed in the accreditation certificate.
Liste der Prüfverfahren im akkreditierten Bereich
VMPA-Prüfstelle gem. DIN 4109
VMPA test center according to DIN 4109
Akustikbüro K5 GmbH is a member of VMPA (Verband der Materialprüfanstalt e.V.) and a certified sound insulation testing laboratory according to DIN 4109. Our testing laboratory is listed in the VMPA directory under the following number VPMA-SPG-233-21-B.

Notified body
We have been notified by the State of Berlin as an expert body in accordance with § 29b of the Federal Immission Control Act (BImSchG) in conjunction with the Ordinance on the Notification of Immissions (41. BImSchV) for the activities referred to in paragraph V.
A publication of the announcement can be viewed via the RESYMESA research system of measuring points and experts.
Quality management
Akustikbüro K5 GmbH operates a quality management system. This is a prerequisite for accreditation according to DIN EN ISO/IEC 17025 as a testing laboratory-we live the system and use it for improvement and error prevention.
Publicly appointed expert for room acoustics
Tobias Kirchner is a publicly appointed and sworn expert for room acoustics by the Berlin Chamber of Industry and Commerce. Link to the entry of the IHK: to the nationwide expert directory.
Publicly appointed expert for speech intelligitility for sound systems
Jakob Kraft is a publicly appointed and sworn expert for speech intelligibility for sound systems by the Berlin Chamber of Industry and Commerce. Link to the entry of the IHK: to the nationwide expert directory.
Memberships & Standards Committees
Tobias Kirchner is a member of DEGA as well as a member of the DIN and VDI standards committee for acoustics, noise reduction and vibration technology (subcommittee NA 001-02-03-03 UA for the revision of DIN 18041).Jakob Kraft is a member of DEGA’s standards committee “Voice Alarm Systems and Electroacoustic Emergency Warning Systems” (DKE/AK 713.1.17). In this committee the DIN VDE 0833-4 is supervised among other standards.
What our customers say
We received very good and competent advice here. The project (room acoustics and sound system in a Baptist church) was excellently supported by Jakob Kraft throughout the entire period, which unfortunately took a little longer due to other factors. He was a very patient and pleasant contact who took our individual wishes well. We are very satisfied with the result! A real recommendation! Thanks very much! 🙂
27-01-2023 via Google
David Dammann
We have worked extensively with Jakob Kraft to ensure that announcements can be understood in a variety of vehicles. He has always helped us to identify sources of error and to find pragmatic solutions. We were also able to rely on the analyzes of K5 when selecting the speaker, which is now paying off with very good speech intelligibility. Thank you for the competent and solution-oriented cooperation, always happy!
07-11-2022 via Google
Manuela St Claire
Great cooperation in connection with the leveling of the Neulich brewery. Very friendly team.
26-01-2023 via Google
Steffen Brückner
There was a deadline from the building supervisory authority for the delivery of the report or the forecast. I was very positively surprised at how professionally and quickly the work was carried out by the acoustic office K5. So a clear recommendation.
23-08-2020 via Google
Erhard S.
Reliable, competent, legally compliant, and always solution-oriented for authorities and organizers - that applies to the entire K5 team 🙂
25-09-2021 via Google
Olaf Möller